基于频率特性的平行板电容式土壤水检测研究
发布时间：2018-09-08 09:03
【摘要】：设计了平行板电容式土壤湿度检测装置,提出了基于频率特性的检测方法。分析了平行板电容的边缘效应;并建立了检测电容关于介质相对介电常数和探头插入深度的函数关系式。以不同含水率的乙醇溶液和沙土作为介质进行试验,提出理论电容公式乘以比例系数的标定方法,标定后的理论值与试验值拟合良好。研究对于设计低成本、可应用于野外的平行板结构的电容式土壤湿度传感器具有良好的借鉴意义。
[Abstract]:A parallel plate capacitive measuring device for soil moisture was designed and a method based on frequency characteristics was proposed. The edge effect of parallel plate capacitance is analyzed, and the functional expression of measuring capacitance on dielectric relative dielectric constant and probe insertion depth is established. Using ethanol solution with different moisture content and sandy soil as the medium, the calibration method of theoretical capacitance formula multiplied by proportional coefficient is proposed. The theoretical value is fitted well with the experimental value after calibration. The study can be used as a reference for the design of capacitive soil moisture sensor with low cost and can be applied in the field with parallel plate structure.
【作者单位】： 太原理工大学化学化工学院;
【分类号】：S152.7
，
本文编号：2230067
[Abstract]:A parallel plate capacitive measuring device for soil moisture was designed and a method based on frequency characteristics was proposed. The edge effect of parallel plate capacitance is analyzed, and the functional expression of measuring capacitance on dielectric relative dielectric constant and probe insertion depth is established. Using ethanol solution with different moisture content and sandy soil as the medium, the calibration method of theoretical capacitance formula multiplied by proportional coefficient is proposed. The theoretical value is fitted well with the experimental value after calibration. The study can be used as a reference for the design of capacitive soil moisture sensor with low cost and can be applied in the field with parallel plate structure.
【作者单位】： 太原理工大学化学化工学院;
【分类号】：S152.7
，
本文编号：2230067
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